/*
 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package javax.swing.plaf.synth;

import java.beans.*;
import javax.swing.*;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Insets;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.SeparatorUI;
import javax.swing.plaf.UIResource;
import javax.swing.plaf.DimensionUIResource;

/**
 * Provides the Synth L&amp;F UI delegate for
 * {@link javax.swing.JSeparator}.
 *
 * @author Shannon Hickey
 * @author Joshua Outwater
 * @since 1.7
 */
public class SynthSeparatorUI extends SeparatorUI
    implements PropertyChangeListener, SynthUI {

  private SynthStyle style;

  /**
   * Creates a new UI object for the given component.
   *
   * @param c component to create UI object for
   * @return the UI object
   */
  public static ComponentUI createUI(JComponent c) {
    return new SynthSeparatorUI();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void installUI(JComponent c) {
    installDefaults((JSeparator) c);
    installListeners((JSeparator) c);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void uninstallUI(JComponent c) {
    uninstallListeners((JSeparator) c);
    uninstallDefaults((JSeparator) c);
  }

  /**
   * Installs default setting. This method is called when a
   * {@code LookAndFeel} is installed.
   */
  public void installDefaults(JSeparator c) {
    updateStyle(c);
  }

  private void updateStyle(JSeparator sep) {
    SynthContext context = getContext(sep, ENABLED);
    SynthStyle oldStyle = style;

    style = SynthLookAndFeel.updateStyle(context, this);

    if (style != oldStyle) {
      if (sep instanceof JToolBar.Separator) {
        Dimension size = ((JToolBar.Separator) sep).getSeparatorSize();
        if (size == null || size instanceof UIResource) {
          size = (DimensionUIResource) style.get(
              context, "ToolBar.separatorSize");
          if (size == null) {
            size = new DimensionUIResource(10, 10);
          }
          ((JToolBar.Separator) sep).setSeparatorSize(size);
        }
      }
    }

    context.dispose();
  }

  /**
   * Uninstalls default setting. This method is called when a
   * {@code LookAndFeel} is uninstalled.
   */
  public void uninstallDefaults(JSeparator c) {
    SynthContext context = getContext(c, ENABLED);

    style.uninstallDefaults(context);
    context.dispose();
    style = null;
  }

  /**
   * Installs listeners. This method is called when a
   * {@code LookAndFeel} is installed.
   */
  public void installListeners(JSeparator c) {
    c.addPropertyChangeListener(this);
  }

  /**
   * Uninstalls listeners. This method is called when a
   * {@code LookAndFeel} is uninstalled.
   */
  public void uninstallListeners(JSeparator c) {
    c.removePropertyChangeListener(this);
  }

  /**
   * Notifies this UI delegate to repaint the specified component.
   * This method paints the component background, then calls
   * the {@link #paint(SynthContext, Graphics)} method.
   *
   * <p>In general, this method does not need to be overridden by subclasses.
   * All Look and Feel rendering code should reside in the {@code paint} method.
   *
   * @param g the {@code Graphics} object used for painting
   * @param c the component being painted
   * @see #paint(SynthContext, Graphics)
   */
  @Override
  public void update(Graphics g, JComponent c) {
    SynthContext context = getContext(c);

    JSeparator separator = (JSeparator) context.getComponent();
    SynthLookAndFeel.update(context, g);
    context.getPainter().paintSeparatorBackground(context,
        g, 0, 0, c.getWidth(), c.getHeight(),
        separator.getOrientation());
    paint(context, g);
    context.dispose();
  }

  /**
   * Paints the specified component according to the Look and Feel.
   * <p>This method is not used by Synth Look and Feel.
   * Painting is handled by the {@link #paint(SynthContext, Graphics)} method.
   *
   * @param g the {@code Graphics} object used for painting
   * @param c the component being painted
   * @see #paint(SynthContext, Graphics)
   */
  @Override
  public void paint(Graphics g, JComponent c) {
    SynthContext context = getContext(c);

    paint(context, g);
    context.dispose();
  }

  /**
   * Paints the specified component.
   *
   * @param context context for the component being painted
   * @param g the {@code Graphics} object used for painting
   * @see #update(Graphics, JComponent)
   */
  protected void paint(SynthContext context, Graphics g) {
    JSeparator separator = (JSeparator) context.getComponent();
    context.getPainter().paintSeparatorForeground(context, g, 0, 0,
        separator.getWidth(), separator.getHeight(),
        separator.getOrientation());
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void paintBorder(SynthContext context, Graphics g, int x,
      int y, int w, int h) {
    JSeparator separator = (JSeparator) context.getComponent();
    context.getPainter().paintSeparatorBorder(context, g, x, y, w, h,
        separator.getOrientation());
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public Dimension getPreferredSize(JComponent c) {
    SynthContext context = getContext(c);

    int thickness = style.getInt(context, "Separator.thickness", 2);
    Insets insets = c.getInsets();
    Dimension size;

    if (((JSeparator) c).getOrientation() == JSeparator.VERTICAL) {
      size = new Dimension(insets.left + insets.right + thickness,
          insets.top + insets.bottom);
    } else {
      size = new Dimension(insets.left + insets.right,
          insets.top + insets.bottom + thickness);
    }
    context.dispose();
    return size;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public Dimension getMinimumSize(JComponent c) {
    return getPreferredSize(c);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public Dimension getMaximumSize(JComponent c) {
    return new Dimension(Short.MAX_VALUE, Short.MAX_VALUE);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public SynthContext getContext(JComponent c) {
    return getContext(c, SynthLookAndFeel.getComponentState(c));
  }

  private SynthContext getContext(JComponent c, int state) {
    return SynthContext.getContext(c, style, state);
  }

  public void propertyChange(PropertyChangeEvent evt) {
    if (SynthLookAndFeel.shouldUpdateStyle(evt)) {
      updateStyle((JSeparator) evt.getSource());
    }
  }
}
